To reduce engine noise, start by ensuring your engine oil is fresh and of the correct grade, as degraded oil causes friction and ticking. Next, apply automotive sound-deadening mats and heat-resistant foam liners under the hood to dampen vibrations and absorb noise before it reaches the cabin.
Install Sound Deadening Materials
Materials like dense mass-loaded vinyl are effective for this purpose. Hood Liners: Adding sound-absorbing liners under the hood can dampen engine noise before it reaches the cabin. Ensure these materials are heat-resistant to withstand engine temperatures.
In addition to putting in new oil, there are proven additives you can add to your oil to improve performance and quiet your lifters and engines. High-quality products such as our legendary Rislone Engine Treatment serve this purpose and can significantly quiet noisy engines.
Treating engine noise depends on whether it's an internal mechanical problem or external airborne noise. Address mechanical ticks and knocks by using high-viscosity oil stabilizers or specialized hydraulic lifter additives. For airborne and structural noises, apply heat-resistant acoustic dampening liners under the hood and on firewall bulkheads.
Experience smoother engine operation with Liqui Moly's Hydraulic Lifter Additive as it targets and revitalises hydraulic lifters, ensuring optimal valve function and reducing noise levels.
To stop lifter noise, the most effective additives are Liqui Moly Hydraulic Lifter Additive or Sea Foam Motor Treatment, which clean varnish and sludge that cause sticking. These additives, designed to restore oil flow, should be added directly to your crankcase to reduce, or eliminate, the "ticking" noise caused by restricted, contaminated lifters.
Sometimes, but it is not a recommended solution. Thicker (higher-viscosity) oil can temporarily mask sounds like lifter tick by cushioning worn parts, but it does not fix the underlying mechanical problem.
Yes, Sea Foam Motor Treatment can quiet noisy lifters if the noise is caused by varnish, sludge, or sticky residue restricting oil flow. It works by cleaning these deposits, allowing the hydraulic lifters to function properly. For best results, add 1.5 oz of Sea Foam per quart of oil and drive for 100–300 miles before an oil change.
Yes, STP can often quiet a noisy engine, particularly if the noise comes from worn parts like lifters or valves. STP oil treatments work by thickening your motor oil and providing a thicker cushion between metal parts. However, it is a temporary Band-Aid and will not fix the underlying mechanical damage causing the noise.
Commonly recommended oil additives for stopping engine knocking include hydraulic lifter additives and high-mileage oil treatments. For tappet and lifter noise, LIQUI MOLY 1009 is a highly suitable choice, as it cleans oil passages and restores oil pressure to the valvetrain.
Yes, Liqui Moly Hydraulic Lifter Additive generally works and is highly regarded. It is highly effective at reducing or eliminating annoying "lifter tick" and valve train noise, especially in older or high-mileage engines.
These 6 ways can make your car's engine smooth and nimble. Let's find out!
Fixing noisy hydraulic lifters without removing them usually involves clearing clogged oil passages or re-establishing proper oil pressure and viscosity. You can often quiet a ticking lifter by performing a flush, adding a specialized treatment to the crankcase, or executing an Italian Tune-Up.
Mass-Loaded Vinyl (MLV) – Best for Blocking Sound
While it's more affordable than some high-end soundproofing materials, it remains highly effective for walls, ceilings, or floors. If you need a cost-effective way to reduce sound transmission, installing MLV is an excellent choice.
Common causes:
Worn serpentine belt: Over time, belts dry out, crack, or lose tension. Loose alternator or pulley: Misalignment can cause a squeal as belts slip under load. Failing tensioner: When tensioners lose spring strength, they can't keep proper belt pressure.
The best additive depends on the type of noise your engine is making:
If you put 10W-30 instead of 5W-30 in your engine, your car will likely be fine, but it will face extra strain during cold starts.
While Seafoam is a great multi-purpose preventive additive, specialized products often outperform it depending on your exact goal: Red Line SI-1 is better for deep fuel injector cleaning, Sta-Bil is superior for long-term fuel storage, and Berryman B-12 Chemtool is a stronger solvent for hard carbon deposits.
The best overall engine treatment specifically designed to quiet noisy hydraulic lifters is Liqui Moly Hydraulic Lifter Additive. It is formulated to clean valve bores and oil passages while maintaining oil viscosity to properly fill and quiet sticky or worn lifters.
In our opinion, the added cost is the only disadvantage of using Sea Foam Spray, although the benefits could outweigh the added expense.
To clean out harmful deposits and eliminate knocks and pings, try adding a bottle of Motor Honey 2-in-1 Injector Cleaner + Octane Booster at your next fill-up. As the name suggests, it both cleans out deposits and improves the octane level of your fuel.
Using 5W-30 instead of 5W-20 in an engine designed for the latter is generally safe for daily driving. Because 5W-30 is slightly thicker at operating temperatures, you gain better engine protection and high-heat resistance, though you may experience a negligible drop in fuel economy.
Exhaust leak ticking: A small exhaust leak, especially near the cylinder head, can produce a ticking sound that can be mistaken for a lifter.